5. Rotifera and Nematoda have the following differences from the flatworms, except:

a. They are round and have circulatory systems and a complete digestive system.b. Bilateral symmetryc. Sensory organs and a head (cephalization)d. They include species that live off of other animals.e. A third germ layer is produced that leads to true muscle and nerve tissue.

Invertebrates Get More Complex

1. What are the basic parts of a mollusk?

2. Cephalopods have some qualities that make them different from other mollusks. Which one of these is NOT one?

a. Open circulatory systemb. Ability to camouflage themselvesc. Tentacles with suckers d. Ink sac to distract predatorse. Bursts of speed by propelling water out of mantle cavity

Parapodia are like feet. Sponges are a kind of parazoa. Septa are the walls between the segments of a worm. A spatula belongs in the kitchen.

4. The segments of an annelid body are called:

d. Metameres

Lots of metas. Metazoa is another name for the kingdom Animalia. Metabolites are things produced during metabolism. Metacarpals are bones in your fingers.

5. Parapodia serve a similar purpose to:

d. Feet

"Podia" means feet.

Life Takes to the Land

1. Arthropods have an exoskeleton made of:

d. Chitin

Chitin is the tough carbohydrate that covers arthropods.

2. Arthropods can be broken into five subphyla, which are:

Trilobita, Chelicerata, Crustacea, Myrapodia, Hexapodia

3. Insects and spiders are arthropods, but not from the same subphylum. List some differences:

A. Six legs (insect) and eight legs (spider)B. Three body parts or tagmata (insect) and two (spider)C. Antennae (insect) and no antennae (spider)

4. Crustacean legs are unusual for arthropods. They are biramous, which means:

e. One segment of the leg branches into two segments

Crustaceans do not have two legs on each segment or specifically on the abdomen. Two segments per leg is not unique to crustaceans. It's those double ends on crustacean legs that are unique.

Controversial Cousins

1. Lophophores are different than the tentacles around the mouth of other animals like octopus because:

These tentacles are hollow extensions of the coelom and are lined with cilia.

2. Brachiopods look like mollusks, but are actually more closely related to:

a. Bryozoa

None of the rest of these are Lochotrophozoa.

3. What powers the tube feet of echinoderms?

Hydraulic pressure within a water vascular system

4. Like arthropods, an echinoderm's life cycle is characterized by what process:

b. Metamorphosis

Parthogenesis isn't a life cycle (life style, maybe), but a form of reproduction. Budding is a form of reproduction too. Regeneration is a way to produce lost body parts and molting is a way to replace worn-out parts or parts that are too small.

Get a Backbone

1. What are the three Chordate subphyla and what do they have in common?